Plaster-mixer.



A. NYDEGGER.

PLASTER MIXER. APPLICATION FILED NOV. 4, 1914.

1 131 I v Patented Mar. 9, 1915.

2 SHEETS-SHEET 1.

A. NYDEGGER.

PLASTER MIXER.

APPLICATION FILED NOV. 4, 1914.

1 1 3151+ Patented Mar. 9, 1915.

2 SHEETSSHEET 2.

WTWW vfyd 7 SS N ADOLPH NYDEGGER, OF MILWAUKEE, WISCONSIN, ASSIGNOR T C. H. & E. IVLANUFAC- TUBING COMPANY,

OF MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

' PLASTER-MMER.

Specification of Letters Patent.

Patented Mar. 9, 1915..

Application filed November 4, 1914. Serial No. 870,178.

' which the following is a description, reference being had to the accompanying drawings, which are a part of this specification.

This invention has for its object to provide a machine for mixing plaster, mortar and the like and consists of a cylindrical drum containing stationary and rotary mixing blades or paddles, the rotary blades being driven from beneath the drum so as to leave the upper end of the drum open for admitting the materials to be mixed, said drum being provided with a sliding gate on the bottom thereof for permitting the mixture to be discharged therefrom.

Another object of the invention is to perfect details of construction of such a mixer in order that the mixing operation may be quickly and thoroughly performed and in order that the mixing blades may be quickly removed for cleaning the drum.

With the above and other objects in View the invention consists in the plaster mixer as herein claimed and all equivalents.

Referring to the accompanying drawings in which like characters of reference indicate the same parts in different views: Figure 1 is a plan view of a plaster mixer exemplifying the invention; Fig. 2 is a central sectional side view thereof; Fig. 3 is a central sectional view on a plane at right angles to the plane of Fig. 2. Fig. 4c is a detailed view of the rack and pinion means for controlling the discharge from the drum; and Fig. 5 is a detailed sectional view thereof.

In these drawings 10 indicates a truck mounted on wheels 11 so as to be readily moved fromplace to place and 12 is a frame mounted thereon having rigidly fastened to it a cylindrical drum 13 having an upstanding tubular sleeve 1 1 at its center passing through an opening in thebottom of the drum and fixed in place by means of nuts 15 threaded thereon above and below the bottom of the drum. square shaft 16 fits within the sleeve 14: and 1s journaled within I a selfv alinement thrust bearing 17 on the frame with a beveled gear 18 between the bearing and the drum. A shaft 19 journaled on the frame carries a beveled pinion 20 meshing with the beveled gear 18 and at its outer end is a sprocket wheel 21 driven by a chain 22 from a sprocket wheel 23 on a jack shaft 24 which is journaled across the frame.

A gas engine or other motor on the truck drives the jack shaft 2a through a chain 25 engaging a sprocket wheel 26 on the shaft and having driving connection with the shaft by means of a suitable clutch 27 operated by a lever 28. At its upper end a square shaft 16 is turned down to fit within a bearing 28 carried by a spider frame 30 which preferably consists of three arms as shown clamped to the edge of the drum by means of clamping nuts 30' threaded on studs 31, the arms of the spider frame having slots opening in the direction of the turning of the shaft to facilitate their ready detachment when the nuts are loosened without rendering them liable to disconnection during the operation of the machine. Stationary mixing rods or paddles 32 are secured to 33 having a circular boreto fit the reduced 1 turned end of shaft 16 and a lower circular bore to fit around the sleeve 14 and an inter? mediate portion square in cross section to fit between the upper end of the square portion of shaft 16 so as to be positively connected with the shaft and turned therewith carries a downwardly extending arm 34 spaced from the sleeve 14 with an outwardly ex tending scraping blade 35 engaging the bottom of the drum or traveling close thereto to scrape the material from the bottom of the drum, its front edge being-preferably beveled for that purpose. At its upper end the scraper blade 35 carries an upwardly extending scraper rod 36 which is beveled to form a knife edge scraping against or traveling close to the walls of the drum to scrape material therefrom and another mixing rod projects upwardly from the scraper blade 35 at a position to travel between the stationary mixing rods 32.

A discharge opening is formed in the bottom of the drum with a spout 38 to deflect the discharged material away from the driving gear and into a wheel-barrow or the like beneath and this opening is normally closed by a'sliding gate 39 which fits between guides 40 on the bottom of the drum and carries a rack 41 meshing with a pinion 42 on a shaft 43 journaled beneath the drum with a crank handle 44 by means of which it is turned for opening and closing the sliding gate. A chain 45 connecting the sliding gate with the drum serves to limit the opening movement of the sliding gate and in order that the edges of the discharge opening may not form shoulders in the bottom of the drum against which gravel or the like may engage for interfering with the movements of the scraper blade 35 a protecting plate 46 of the thickness of the bottom of the drum and corresponding in size to the discharge opening is mounted on the sliding gate 89 to just fit the discharge opening when the sliding gate is closed.

A feed spout 4:7 may besuitably mounted at one side of the drum to guide thefeed of material into that portion of the open upper end of the drum which is without one of the arms of the spider frame 30. When the materials are placed in the drum the turning of the shaft 16 causes the arm 34, the scraper blade 35 and the mixing rods or paddles 36 and 87 to turn around the drum and cooperate with the stationary mixing rods 32 to effect a thorough and complete and rapid mixture, the scraper blade 35 and the scraper rod 36 scraping the material away from the bottom and the-walls of the drum respectively so that the mixing operation is effected evenly throughout the material. By turning the crank handle 44: the sliding gate 39 may be opened to discharge the mixture into a receptacle below.

It is very important in a plaster mixer that the parts should be thoroughly cleaned each night as particles of set plaster will 4 cause the fresh mixture to set more quickly in localized spots and consequently provision is made in the plaster mixer of this invention for a quick and easy removal of the parts for cleaning. It is only necessary to loosen the nuts 30 when the spider frame 30 may be turned slightly to disengage the slotted ends of its arms from the studs 31 and it may then be lifted off of the shaft 16 for cleaning the mixing rods 32. The socket 33 may also be lifted 011? of the shaft 16 for cleaning its parts and the drum without obstruction therein may be flushed with a hose and readily cleaned so that all operating parts are cleaned without difliculty.

It is obvious that the mixer of this invenlar shoulder of the shaft, a downwardly extending arm on the socket, upstanding rotary mixing rods carried by the arm, a frame removably clamped to the drum and having a bearing receiving the end of the shaft, and stationary mixing rods mounted on the frame out of the path of travel of the rotary mixing rods.

2. A plaster mixer, comprising a vertical stationary cylindrical drum, a tubular sleeve fixed in the center of the bottom of the drum and extending upwardly therein, a suitably operated shaft within the sleeve having an angular shoulder projecting thereabove, a frame removably clamped to the upper end of the drum and having a bearing receiving the upper end of the shaft, a socket removably fitting on the shaft and engaging the driving shoulder thereof to be turned thereby, an arm projecting downwardly from the socket, a scraper blade carried by the arm for scraping the bottom of the drum, an upstanding scraper rod at the end of the scraper blade for scraping the side walls of the drum, and downwardly extending mixing rods on the frame.

3. A plaster mixer, comprising a vertical cylindrical stationary drum, an upstanding tubular sleeve fitting in a central opening in the bottom thereof, a suitably driven square shaft fitting within the sleeve with a reduced upper end circular in cross section, a spider frame having arms releasably clamped to the upper edge of the drum and provided with a bearing to receive the reduced end of the shaft, stationary mixing rods projecting downwardly from the arms of the spider frame, a socket removably fitting on the upper end of the souare portion of the shaft and around the reduced portion of the shaft and around the upper end of the sleeve, a downwardly projecting arm on the socket spaced from the sleeve, a scraper blade carried by the lower end of the arm to scrape the bottom of the drum, an upstanding scraper rod carried by the upper end of the scraper blade to scrape the inner walls of the drum, and an upstandingmixing rod secured to the scraper blade and traveling between the stationary mixing rods.

4-.. A plaster mixer, comprising a stationary vertical cylindrical drum, an upstanding sleeve, :1 socket removably secured to the carried by the frame and projecting into 10 shaft above the sleeve, upstanding mixing the drum to cooperate With the upstanding rods carried by the socket, clamping bolts at mixing rods.

the edge of the drum, a frame fitting on the In testimony whereof, I aflix my signaedge of the drum and having slots extendture, in presence of two witnesses.

mg in the rotary direction of the shaft for ADOLPH NYDEGGER. engaging the clamping bolts, a bearing car- Witnesses: ried by the frame and receiving the upper R. S. C. CALDWELL,

end of the shaft, and stationary mixing rods KATHERINE HOLT. 

